package com.zr.web;

import com.alibaba.fastjson.JSON;
import com.zr.mapper.BrandMapper;
import com.zr.pojo.Brand;
import com.zr.service.BrandService;
import org.apache.ibatis.session.SqlSession;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/brandlist")
public class BrandList extends HttpServlet {
    private BrandService service = new BrandService();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1. 调用BrandService完成查询
        List<Brand> brands = service.selectAll();
        //System.out.println(brands);
        //2. 存入request域中
        /*req.setAttribute("brands",brands);
        //3. 转发到brand.jsp
        req.getRequestDispatcher("/brand.jsp").forward(req,resp);*/

        //2. 转为JSON
        String jsonString = JSON.toJSONString(brands);
        //3. 写数据
        resp.setContentType("text/json;charset=utf-8");
        //告知浏览器响应的数据是什么， 告知浏览器使用什么字符集进行解码
        resp.getWriter().write(jsonString);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req,resp);
    }
}
